Your model FRS3R3EW5 uses the 218710300 Wrench 218710300 Frigidaire The Frigidaire Wrench 218710300 is used to remove the filter cup on all refrigerators that use filter models WFCB and WF1CB, Puresource and Puresource Plus water filter.

Your model FRS3R3EW5 uses the 218904301 Frigidaire O-ring 218904301 The Frigidaire O-ring 218904301 is used on the filter cup on all refrigerators larger than 26 cubic square feet that use filter models WFCB and WF1CB, Puresource and Puresource Plus water filter.